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Single-Step Synthesis of Cs3Bi2I9 Nanocrystals for Scalable Direct X‑ray Detectors
Ramavath Babu1, Joydip Ghosh2, Nadine J Schrenker3
1CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain.
ACS Energy Letters
|December 18, 2025
Summary
High-quality lead-free perovskite-inspired Cs3Bi2I9 nanocrystals were synthesized for X-ray detection. These materials show improved sensitivity and stability, outperforming current medical imaging technology.
Area of Science:
- Materials Science
- Solid-State Physics
- Nanotechnology
Background:
- Lead-free perovskite-inspired materials are promising for X-ray detection.
- Previous research focused on large single crystals, limiting scalability.
Purpose of the Study:
- To develop a scalable synthesis for Cs3Bi2I9 nanocrystals (NCs) for direct X-ray detection.
- To fabricate and characterize X-ray detectors using these NCs.
Main Methods:
- Facile, scalable, single-step synthesis of Cs3Bi2I9 NCs via ultrasonication.
- Fabrication of X-ray detectors using NC pellets (0.78 cm²) and thick films (9 cm²).
Main Results:
- Synthesized high-quality Cs3Bi2I9 NCs.
- Achieved high bulk resistivity (1 × 10¹¹ Ω cm) and low dark current density (3.3 nA cm⁻²).
- Demonstrated a limit of detection of 108 nGyair s⁻¹, an order of magnitude better than a-Se, with stable performance.
Conclusions:
- Scalable synthesis of Cs3Bi2I9 NCs enables high-performance X-ray detectors.
- The developed detectors offer significant advantages over current technologies for medical imaging.
- Demonstrated potential for large-area X-ray detection applications.
